A Small,perfectly Reflecting Mylar Disc,density 1

question 21

Multiple Choice

A small,perfectly reflecting Mylar disc,density 1.1 g/cm³,radius 0.15 mm,thickness 0.050 mm,is levitated by a laser,whose beam at the point of interaction of beam and disc is 0.35 mm in diameter.Assuming the disc is levitating in a horizontal orientation,what power does the laser emit?

• A)5.7 W
• B)7.8 W
• C)11 W
• D)16 W
• E)31 W

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